Latch



Patented @et 13, 1925.

UNETED STATES `PATENT OFFECE..

FRANK SOLEY, OF PHILADELPHIA, PENNSYLVANIA, A'SSIGNOR TO THE MILLER LOOK COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A COEIORATIO'N 0F PIISII'I'SYLl VANIA.

LATCI-I.

Application filed July 21, 1922. Serial No. 576,520.

To all al1/10m t may conce/rn.:

Be it known that I, FRANK Sonny, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Latches, of which the following is a specification.

My invention relates to certain yimprovements in night latches of the type in which the bolt can be projected to such an extent as to prevent a tool being passed between the bolt and the keeper. This type of latch is known as a double throw latch.

The object of the invention is to improve the construction of a latch of this type and to provide a positive means for holding the bolt when fully projected so that it cannot be pushed back without the use of a knob or a key.

The invention also relates to details of construction of the means for releasing the bolt to enable it to be projected to its full extent.

In the accompanying drawings:

Fig. 1 is a view of my improved night latch with the cover plate removed;

Fig. 2 is an end view of the latch;

Fig. 3 is a sectional view on the line 3--3, Fig. 1;

Fig. 4 is a view, similar to Fig. 1, showing the bolt projected to its full extent and locked;

Fig. 5 is a detachedperspective view of the bolt;

Fig. 6 is a detached perspective view of the locking block for` the bolt;

Fig. 7 is a perspective view of the sliding release plate;

Fig. 8 is a detached perspective view of the locking lever for holding the plate in the normal position; and

Fig. 9 is a detached perspective view of the pivoted arm for holding the bolt in the retracted position.

Referring to the drawings, 1 is the casing of the lock. 2 is the 'cap plate having a tongue 3, which extends under a flange 4 of the casing and has bent portions 5, which are secured to the front wall of the casing by screw bolts 6. Mounted on this cap plate is the key hub 7 having an arm 8, Fig. 3, which is shown by dot and dash lines in Fig. 1. This arm is arranged to come in contact with a pin 9 on an arm 10 on the spindle 11 of the knob 12. The spindle is mounted in the casing l of the lock.

13 is a bolt, which extends throughout the length of the lock and passes through an opening in the forward end and through a guide opening at the rear end. In the bolt is anangular slot 14 through which extends the pin 9 so that, on turning' the key, or the knob, the bolt can be retracted. On the hub of the arm 10 are gear teeth 15, which mesh with the teeth of a rack 16 that forms part of the locking block 17. This locking block has a portion 18, which rests back of a shoulder' 19 on the bolt when the bolt is projected to its full extent. The rear of the block rests against the rear of the casing so that, when the bolt and the locking block are in the position shown in Fig. 4, it is impossible to move the bolt as the block forms a positive stop therefor.

20 is a coiled spring mounted on a stud 2()a projecting from the casing. The stud and spring extend into an opening 21 in the locking block, asshown in Figs. 1 and 6. The spring not only actnates the locking block, but also acts through the locking block, the geared hub 10, and pin 9, to project the bolt. Located at one side of the bolt is a sliding release plate 22. The forward movement of this release plate is limited by the keeper, as the bolt is so proportioned in lrespect to the opening in the keeper that the plate will strike the edge of the keeper and will be held while the bolt is further projected. The plate is slotted at 23 and extending into the slot is a pin 24 on the bolt 13. The slot 14C in the bolt is formed, as shown, so as to allow the pin to move a given distance in one direction after projecting the bolt to allow the block 17 to assume a position back of the bolt. l/Vhen it is wished to withdraw the bolt, the pin is allowed to travel a given distance in the slot to allow the block to move clear of the bolt before the pin acts to retract the bolt. 1

The above construction allows the bolt to retract the plate when-it is operated by the key, or the knob, andalso allows the bolt to be projected to its full extent while the plate is held back by the keeper. rThe sliding plate has an offset slot 25 through which extends a pin 26 on a locking lever 27, loosely pivoted at 28. This locking lever has a lateral projection 29, which extends over the bolt 13. The bolt is cut away at 30 to receive theportion ot'` the locking llever and is f undercut at 31 to prevent the lifting of the locking lever when the bolt is first retracted. l .When theboltis withdrawn, the plate 22 s-withdrawn withit, and,fas the plate-is retracted, it lifts the lever 27. As the plate'is held in the retracted position by the keeper, the bolt is allowed to move to its full extent,

as shown in Fig. 1.

32 is a spring coiled around a stud 33. 'Thisspringbears against a lugA on the plate 22 so that, whenltheplate isfreleased,

itis "projected by Athis spring. 11n-order to 'lock the bolt inthe full retractedposition, Jangfarmiisprovided, which is adapted to lenter'a 'notch V3G in the bolt. This armis mouritedfon aAlspind-le 28, whichformsthe 'fpivot forthe'lever`27. This-spindle extends 'through the casing 1 vand has an arm F37. 'Thisarmcanbemovedfso as to raise,or depress, the yarm 735. Then the bolt is reftracted Vand-'thelarm 35 is depressed, it enters 1`the notch 36 lin the bolt andholds the'bolt 'inf'the full retracted position.

By the construction hereinbefore described, '=it'willbe-seen that the bolt can v'beheld in the retracted position' by the arm r35. When fthe'bolt is released, it isreturne'dfto itsfno-rmal position, as A-shown in Figs. 1 Aand I2. The sliding plate is carried withthe bolt.

When 4a door, to which the lock is atftached, is closed, Athe *bolt is retracted "by scoming in contact with 'the keeper '.andfit carries the slidingplate22vwith it. YAs soon v'asf the bolt passes the edge ot' thekeeper,itis uprojected,Zbutfthe'sliding plateis `held by the keeper. `The Sliding Vplate also 'holds the 40 ,lever 27 clear of the bolt 13, allowing the bolt to be gprojected fto its full extent-or `double throw position-as fshown in Fi'g. 4. When, infthis'position, the locking-bloclrl'? 1is'moved backof the shoulder 19 so that it iforms a positive lock.forthesbolt,which can only be retracted by theuse of a'key, or vby turningthe knob.

I lclaim:

t1. The combination 'of V'a casing; fa bolt '=0 mountedtherein; an arm; a Ilocking'block geared :thereto 'and arranged Ato `be located Ybacl'rot'fthe bolt whenthe bolt is :in a fully 'projected :position,:said arm retractingl'the fbolt and operating the loclinglblock.

2. The combination of a casing; azslotted, fslidingbbolt:mounte'ththerein; an arm having a pin extending Sintofthe slot `by which the .bolt isretracted; anda locking block'ihaving ,an :extension adapted to restsbackroflthe 'bolt G0 awlhen saidrbolt is :fully rprojected.

3. The combination o'facasing; a slotted, :sliding-bolt mounted therein; aniarmhaving fa :pin `extending into the slot by :which the :boltis -retracted; a 4locking block havingfan extension :adapted 5to mest back of .the `bolt when said bolt is fully projected; and a spring tending to hold the block yieldingly in its projected position.

1. The combination of a casing; a bolt mounted therein, said bolt having an angu- `lar slot, the -front vwall -of the islet being curved; an Voperating arm vhaving pin adapted to the slot; and a locking block `Ygeared to the arm so that the pin will have lost motion to allow the block to assume a :position .backofthe bolt when the bolt is projected.

The combination of a casing; .a bolt Amounted therein; an arm'for retractin'gthe b olt, said-arn'lhavingteeth;and a sliding block having a rack'meshmg'with the teeth of the arm, ysaid locking "block having a portion arrangedfto be located Vbaclt'offthe bolt Ywhen tlie bolt is Ifully projected.

6. Thecombination of acasing; a sliding bolt'mounted therein, said bolt fbeing slotted; an armhaving a pin extending' into the slot and by which the bolt is retractedpsaid arm having'teeth; a locking block `having'a `rack meshingn withthe teeth,'the'boltfhaving `ashoulderand the block having -a .portion -adapted 'to -rest back 'of the shoulder'when plate; a flever arranged to engage the Lbolt and having a pin extending into thess'l'ot, said leverholdingtheboltiin itsnormal position; and a spring orvprojecting the bolt.

8. The combination of a casing.; :a :bolt fslidably mountediinlthefcasing; means .for retracting the bolt; a block for loclnng; the `bolt in its full projected `position a 'eslidmg plate at the side offthebolt, :said plate havinfg 1a slotandpin 'connection 'with th'ebolt vso that it is retracted with thebolt, .the bolt being reefto be projected independently of the plate; landa lever-pivoted to .the-.casing and actuated by the sliding 'plate,tlre libolt 'having ran undercut `Y'portion ,and the lever y:having `an extension 'arranged lto kbie projected into the undercut p'ortion Vwhen @the fboltisinz its normalposition. y

9. The Vcombination .of 1a :ca-sing; .a sliding -lbolt :mounted therein.; an armfhavlng `v`a `.pin

for actuating the bolt, said arm :having .la Pse- \ries of` teeth a locking block :having `a rack Imeshing `with 'the vteeth of the arm; a

spring -'or projecting `'the bolt; .means lfor holdingthe bolt'infits normal'position; and `:means 1for 'releasing 4the 'bolt so that 1t :can he projected toits full-.extended position.

10. The combination of a casing; a bolt sldably mounted therein, said bolt being slotted; an arm having a pin extending into the slot, said pin actuating the bolt; a locking block geared to the arm; a spring pressing against the block; a sliding plate connected to the bolt; a lever actuated by the plate, said lever being arranged to hold the bolt in its normal position, the looking block holding the bolt in its full extended posi- 10 tion, the bolt being notched; an arm arranged to enter the notch and to hold the bolt in its retracted position, said arm bein mounted on a spindle extending throug the casing; and an operating arm on the 15 spindle for moving the locking arm into and out of position.

FRANK SOLEY. 

